Spark-arrester.



R HI TREVITHIOKL PATENTED DBC. 26, 1905 SPARK ARRESTER.

APPLICATION FILED MAY27.1905.

n me,

attenua? FREDERICK H. TREVITHICK, OF CAIRO, EGYPT.

SPARK-ARRESTER.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application ne@ May v27. 1905. serai No. 262,580.

fo all wiz/07N] it may concern:

Be it known that I. FREDERICK H. TRE- vITI-IICK, a subject of the King of Great Britain and Ireland, residing at Cairo, Egypt, have invented certain new and useful Improvements in Spark-Arresters, of which the following is a specification.

My invention relates more particularly to spark-arresters for steam-boilers of the locomotive type, but is also applicable to semiportable and other engines and boilers of the combined type.

The objects of my invention are, first, to provide a construction which may be readily attached to existing forms of locomotives or similar type of boilers without in any Way changing the present form or construction of smoke-boxes or adding to the cost of their manufacture; second, to attach a bathe-plate in front of the foraminous plate or wire-netting in order that the draft of the furnacegases through the boiler-tubes is so distributed, and especially the lower ones, as to4 keep them entirely free of ashes, &c. third, to so attach the foraminous plate or wire-netting and the baffle-plate to the smoke-box door that they are removed away from or into kthe smoke-box without disturbing the other elements of the spark-arrester or the operative relations of the said wire-netting and baffle-plate fourth, to construct a sparkarrester in which the objects above stated are satisfactorily carried out without in any manner checking the required draft necessary for an efficient operation of the furnace and boiler.

The invention consists of novel structural features and relative arrangements thereof, which will be more fully described hereinafter and then pointed out in the appended claims.

A practical embodiment of the invention is represented in the accompanying sheet of drawings, forming a part of this specification, in which similar reference characters indicate corresponding parts in both views.

Figure I is a longitudinal sectional side elevation of a locomotive smoke-box with my improvement attachedf Fig. 2 is an end elevation with the sm oke-box door thrown open.

Referring to the two figures of the drawings, l represents the shell of the boiler, in which are arranged in the usual manner the lues 2, terminating at their forward ends in a fine-sheet 3 and discharging the smoke and gases into a smoke-box 4.

approved manner readily suggested by anyone skilled in the art and forms no essential part of my present invention. The inner shell 6, forming the smoke box or chamber 4, may also be attached to the flue-sheet in any suitable manner, and, as will be seen by reference to the drawings, its outer end does not extend as far out as the outer shell 5.

7 is a stack attached to the upper side of the outer shell 5 and communicates'vvith the annular smoke-flue between the two shells 5 and 6. The said stack 7, boiler-shell l, and outer shell 5 may be provided with the usual outer covering, cleading, or lagging.

8 is the common dry-steam pipe, leading from the steam-dome to'the cylinders of the engine. (Not shown.)

9 is the usual blower-pipe, leading from the air-pump to the stack 7.

l0 is the blast-pipe, passing through suitable openings in the shells 5 and 6 and the smoke-chamber 4 and whose upper end or petticoat pipe-section 10 connects with the stack 7 and its lower end, by means of the stool-section Il, with the exhaust-ports of the engine. (Not shown.) The said stool 11 not only performs the above-stated function of connecting the blast-pipe With the exhaust of the engine, but also, by means of its upper flange abutting against the under side of the inner shell 6, acts as a support for the same in rigidly holding and properly spacing the said shell 6 Within the outer shell 5.

l2 is the smoke-box door, which may be fitted in the circular opening formed by the outer end of the shell 5 and preferably hinged thereto, as shown in the drawings. Attached to the inner side of the door l2 and separated therefrom by studs or spacing sleeves and bolts 13 is an annular plate or frame 14, which snugly [its Within and near the outer edge of the smoke-box chamber 4. Secured to this frame 14 is a circular foraminous plate or Wire-netting 15 of such a mesh as to pre- IOO 16 is a transverse rod attached and supported, preferably, in a horizontal` position near the' outer end of the smoke-chamber 4. This rod 16 is provided with a central elongated opening 17 ,so positionedcas to permit the passage of a head 18 on the turn-bolt 19,passing` through the hinged smoke-box door 12.

2() represents the usual securing' nuts or clamps on the outer end of the turn-bolt 19 for holding the door 12 in its closed position.

21 is a thin and yet stiif barile-plate whose outer' edge is secured to almost the entire upper half of the annular frame 14 and at a suitable distance in front ol'V the,wire-netting;` 15, so as to cause the furnace-gases to be properly and uniformly drawn through the boiler tubesA or ilues 2, especially the lower ones, which will thus be kept clear from ashes, &c. The plate 21 is also sulliciently separated from the inner wall of the door 12 as to leave ample line-space for the upward passage of the furnace-gases to the annular smoke-'Hue between the two shells 5 and 6.

From the Yforegoing` described construction of the wire-netting and baille-plate and the arrangement of fastening the same to the smoke-box door 1 have devised the compact and easily-removable elements of a spark-arrester. All that is necessary when it is desired to inspect, repair the part-s of the device, or remove the accumulated ashes from the apparatus is to swingI open the smokebox door 12, when the smoke box or chamber 4 is entirely clear and open to view and the wire netting` 1.5 readily accessible to be cleaned, inspected, or replaced by a new section, or, if desired, a different door, with the same or dill'erent sized mesh of wire-netting, could be quickly substituted for the old or worn-out one or better adapted for the grade of fuel being burned without unnecessary delays or idleness of the entire locomotive.

lWlliile l have not shown or specifically described it,it can be readily seen th at the smokeboX 4 may be formed at its bottom or lower side with a hopper which will be adapted to receive the collected or accumulated ashes and extinguished sparks, from which they may be conveyed by` a pipe and automatic valve, as is usual in this class el' devices.

From the foregoing,` description of my invention it will be seen that 'l have devised a spark-arrester which is most compact, easily cleaned and repaired, inexpensive, and at the same time readily adaptable to the standard and existing types of locomotives. It will also be noted that the objects as enumerated in my statement of invention have been fully and efficiently carried out, and while I have shown and specifically described one lorm of my invention it can be readily seen and understood by those skilled in the art that many changes may be made without in any way varying the invention or its mode of operation.

Having` now hilly described my invention, what 1 claim as new, and desire to secure by Letters Patent, is-

1. The combination with a locomotiveboiler or the like, of a smoke-box comprising an outer shell, an inner shell separated from and shorter than the outer shell and forming a smoke-chamber communicating` with the iiues of the boiler and an annular smoke-Hue with the outer shell, a smoke-box door closing' the open end of the outer shell, a vloraminous plate separated from and attached to the inner side of the door and adapted to close the open end of the inner shell and a stack connnunicating with the annular smokeflue.

2. The combination with a locomotiveboiler or the like, of a smoke-box comprising` an outer shell, an inner shell separated from and shorter than the outer shell and 'forming1 a smoke-chamber con`imunicating with the vllues of' the boiler and an annular smoke-Hue with the outer shell, a smoke-box door closing the open end of' the outer shell, a Vloraminous plate separated from and attached to the inner side of the door and adapted to close the open end ol the inner shell, a bailleplate interposed in the upper section and between the Vforaminous plate and the door, and a stack connmn'iicating` with th i anmilar smoke-Hue.

3. The combination with a locomotiveboiler or the like,.of a smoke-box comprising' an outer shell, an inner shell separated from and shorter than the outer shell and forming` a smokechamber communicating; with the ilues of the boiler and an annular smoke-rlue with the outer shell, a stack communicating with the annular smoke-fine, a blast-pipe passing through the smoke-chamber and h avingits open end leading' into the annular smoke liuc and stack, a smoke-box door closing' the open end of the outer shell, and a foraminous plate separated from. and attached to the inner side of the door and adapted to close the open end of the inner shell.

4. The combination with a locomotiveboiler or the like, of a smoke-box comprising an outer shell, an inner shell separated from and shorter than the outer shell and forming a smoke-chamber communicating with the flues of the boiler and an annular smoke-flue with the outer shell, a foraminous plate closing the open end of the inner shell, a smokeboX door closing' the open end ot' the outer shell and a baille-plate attached to the inner side and upper section of the door and interposed between the plate and the door.

.ln testimony whereof l affix my -sigi'iature in presence of two witnesses.

FREDERICK TREVITHICK.

Witnesses E. RYE, 1t. AITKEY. 

